Shula behaving oddly

Pippa

Shula has suddenly taken to growling at Pippa. This has started in the last few weeks, why we don't know. Mostly she ignores the cat and in the past if the cat got on a sofa Shula is was on, the dog either got off or took no notice, now she has a little growl. We immediately tell her off and she stops but it would be nice to know why this behaviour has suddenly started.

 We did wonder if it has to do with losing Chia. Shula does know I think, that Chia is dead as she was with me when I found her. She was very concerned when I carried Chia home and I do believe animals understand these things. This is the only explanation I can think of, as nothing else has changed. It would be really nice to know what was going on in their minds. Although the cats have never really been friendly with the dog they have got along and I don't want to start having problems with them now.